Apple makes it easy to setup your work phones either 1-by-1 or all at once using their dedicated application.

You can use Restrictions, also known as parental controls, to block or limit specific apps and features on your iPhone, iPad, or iPod touch.
See this Apple article for instructions on setting this feature up: https://support.apple.com/en-nz/HT201304

Apple offers a program called Configurator 2 which makes it easy to deploy iPad, iPhone, iPod touch, and Apple TV devices in your business.
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This article explains how to use Blueprints, which are restrictions that can be applied to each of your devices: http://help.apple.com/configurator/mac/2.3/#/cad5b401e306

This article explains how to load a configuration file onto your devices, which is a file containing phone Settings and login information:
​http://help.apple.com/configurator/mac/2.3/#/cadbf9de27

Google offers mobile device management through its G Suite program, but it does not offer a way to setup your work phones 1-by-1.

To get started with mobile device management see this Google article: https://support.google.com/a/answer/6328699

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